Visible light cured orthopedic polymer casts
AssigneeJohnson & Johnson Products, Inc.
InventorCarl J. Buck
Life of this patent
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Abstract
An orthopedic cast material is disclosed, which, when wrapped about a body member and cured by exposure to visible light, forms a rigid, high strength immobilizing structure and which comprises an air, light and X-ray permeable fabric impregnated with a formulation comprising (a) acrylate terminated polyurethane oligomers or ethylenically unsaturated polyesters or polyethers, (b) functional acrylate monomers as optional diluents and (c) a photoinitiator which is activated by visible light to initiate the polymerization reaction, whereby the casts produced therefrom show no tendency towards discoloration in ambient light or sunlight, are aesthetic in appearance, are dry to the touch and possess good whiteness.
Claims33
An orthopedic cast material which, when wrapped about a body member and cured by exposure to incandescent visible light which is essentially free of significant actinic radiation in the ultraviolet range of about 200 to 400 nm, forms a rigid, high strength inmobilizing structure and which comprises an air, light and X-ray permeable fabric impregnated with a formulation comprising (a) one or more acrylate terminated polyurethane oligomers, (b) optionally, one or more functional acrylate or methacrylate monomers as reactive diluents and (c) a photoinitiator which is activated by visible light in the wavelength range 400 nm to 750 nm to generate free radicals to initiate the photo polymerization reaction, said photoinitiator being selected from the group consisting of
- (A) 1-hydroxy-1-cyclohexyl phenyl ketone of the formula ##STR6## or (B) (ring substituted or unsubstituted) 2-hydroxy 2,2-dimethyl acetophenone of the formula ##STR7## wherein the substituents R are selected from the group consisting of hydrogen, methyl, dimethyl, isopropyl, tertbutyl, chloro, bromo and fluoro, whereby the casts produced therefrom show no tendency towards discoloration in ambient light or sunlight.
A formulation for use in impregnating a light and X-ray permeable fabric useful for preparing an orthopedic cast material which, when wrapped around a body member and cured by exposure to incandescent visible light which is essentially free of significant actinic radiation in the ultraviolet range of about 200 to 400 nm, forms a rigid, high strength inmobilizing structure, said formulation comprising (a) one or more acrylate terminated polyurethane oligomers, (b) optionally, one or more functional acrylate or methacrylate monomers as reactive diluents, and (c) a photoinitiator which is activated by visible light in the wavelength range 400 nm to 750 nm to generate free radicals to initiate the photopolymerization reaction, said photoinitiator being selected from the group consisting of
- (A) 1-hydroxy-1-cyclohexyl phenyl ketone of the formula ##STR8## or (B) (ring substituted or unsubstituted) 2-hydroxy-2,2-dimethyl acetophenone of the formula ##STR9## wherein the substituents R are selected from the group consisting of hydrogen, methyl, dimethyl, isopropyl, tert-butyl, chloro, bromo and fluoro.
Dependencies are inferred from the claim text.